Table 1.

Number of combinations in every urban stratum

	Central zone	First urbanised belt	Second urbanised belt
Number of villages	25	67	56
Number of possible groups of 3 adjacent villages	102	209	92
Number of possible combinations of 3 groups of 3 adjacent villages	46 828	999 140	60 225
Number of possible combinations of 3 groups of 3 adjacent villages which respect proportions of urbanization types.	6 819	10 851	2 408